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A leaching method for increasing the leaching rate of ion-adsorption type rare earth ores

An ion adsorption type, rare earth ore technology, applied in the direction of improving process efficiency, can solve the problems of difficult precipitation and extraction, affecting the agglomeration and dispersion and migration behavior of mineral soil particles, etc., to achieve easy coalescence, reduce anti-adsorption process, and promote flow. sexual effect

Active Publication Date: 2019-04-16
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for organic matter, it is different from Cl - , NO 3 - For these inorganic acid radical ions, when the former enters the ore body, it not only undergoes anion exchange adsorption, but also is accompanied by the specific adsorption process of ions, and changes according to the different coordination and adsorption methods of its hydrophilic groups and hydrophobic groups on the surface of the ore soil. The surface charge properties of the ore soil and the electrokinetic properties of the system affect the agglomeration and dispersion migration behavior of ore soil particles during the leaching process
At the same time, as far as the amino-containing leaching aid is concerned, it forms stronger coordination groups such as RE-O and RE-N for rare earth ions during the leaching process, which has a negative effect on the precipitation and extraction of rare earth in the subsequent leachate ( At present, the ammonium bicarbonate / oxalic acid coordination precipitation extraction process is mainly used), which has caused certain difficulties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this example, Xunwu light rare earth ore (REO content: 0.089%) was used as raw material. After natural air drying, 200g of ore soil was taken and evenly placed in three leaching columns with an inner diameter of 42mm and PVC material. The bottom layer of each leaching column and the ore The soil surface is filled with 1cm high coarse quartz. Adopt ammonium chloride as leaching agent, sodium succinate as leaching aid, prepare respectively ammonium chloride concentration is 0.3mol / L, sodium succinate concentration is 0mol / L, ammonium chloride concentration is 0.3mol / L, Sodium succinate concentration of 10 -4mol / L, ammonium chloride concentration is 0.3mol / L, sodium succinate concentration is 10 -3 mol / L of the three groups of leaching solutions are 200ml each. Then the three groups of leaching liquids were all immersed into the corresponding three leaching columns at a flow rate of 0.5ml / min, and then rinsed with 100ml deionized water, and all the leaching liquids of...

Embodiment 2

[0034] In this example, Xunwu light rare earth ore (REO content: 0.089%) is used as raw material. After natural air-drying, 200g of ore soil is evenly placed in a leaching column with an inner diameter of 42mm and PVC material, and the bottom layer of the leaching column and the surface layer of ore soil are filled. 1cm high coarse quartz. First prepare 100ml10 -4 mol / L ammonium succinate was used as a leaching aid, and was completely immersed in the ore soil at a flow rate of 0.5ml / min, and the initial leachate was collected. Add an appropriate amount of ammonium chloride and deionized water to the primary leachate to prepare 200ml of a leachate with an ammonium chloride concentration of 0.3mol / L, and completely immerse it in the ore at a flow rate of 0.5ml / min. 100ml deionized water for rinse, and collect all leachate at this stage. The control group used 200ml of ammonium sulfate solution with a concentration of 0.15mol / L as the leaching agent for leaching directly at a f...

Embodiment 3

[0037] In this example, high yttrium and europium-rich rare earth ore (REO content: 0.129%) in the Zudong mining area in Longnan was used as raw material, and 200 g of ore soil was taken after natural air drying and evenly placed in a PVC leaching column with an inner diameter of 42 mm. Ammonium chloride of 0.3mol / L is used as the main leaching agent, potassium succinate is used as the leaching aid, and the molar concentration of the leaching aid is 5×10 -5 mol / L, prepared into 250ml of leaching solution and immersed in the ore soil at a flow rate of 0.5ml / min, then rinsed with 100ml of deionized water, and collected all the leaching solution. The control group used 0.15mol / L ammonium sulfate solution and 0.3mol / L ammonium chloride solution directly as the leaching agent and entered the leaching column at a flow rate of 0.5ml / min for leaching, and then rinsed with 100ml deionized water And collect all its leachate.

[0038] Under the conditions of different leaching agents, t...

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Abstract

The invention discloses a leaching method for increasing the leaching rate of ionic adsorption type rare earth ore. According to the leaching method, a leaching aid agent is added into a leaching agent so that a leaching solution can be prepared, and then, the ionic adsorption type rare earth ore is leached; or the ionic adsorption type rare earth ore is subjected to drip washing through a leaching aid agent solution at first, after drip washing liquid of the ionic adsorption type rare earth ore is collected, a leaching agent is added so that a leaching solution can be prepared, and the ionic adsorption type rare earth ore subjected to drip washing through the leaching solution is leached; and the leaching aid agent is a mixture comprising one or more of succinic acid, sodium succinate, succinic acid and ammonium succinate. According to the leaching method, one or more of the succinic acid, the sodium succinate, the succinic acid and the ammonium succinate are adopted as the leaching aid agent, the aggregation of clay particles in ore is maintained, migration of the clay mineral particles in the leaching process is reduced, meanwhile, the ore penetrating quality can be improved moderately, and the leaching rate is increased.

Description

technical field [0001] The invention relates to the field of rare earth hydrometallurgy, in particular to a leaching method for strengthening the leaching process of ionic rare earth ores. Background technique [0002] Ion-adsorbed rare earth ores are unique rare earth minerals in my country. They contain 15 kinds of rare earth elements (except Sc and Po) and most of them exist in ionic state. It should be extracted by ion exchange. For a long time, the research work on the chemical extraction of ion-adsorption rare earth ores has mainly focused on the effective selection of leaching agents and the chemical behavior characteristics of ore soil leaching. In the late 1920s, an extraction method represented by ammonium sulfate in-situ leaching was developed. The technology is widely used in actual industrial production, thereby greatly improving various technical indicators such as resource recovery rate, product quality, and environmental protection, and realizing the effectiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B3/04
CPCC22B3/04C22B59/00Y02P10/20
Inventor 王莉廖春发杨幼明徐海波王超李开中蓝桥发
Owner JIANGXI UNIV OF SCI & TECH
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